A GENERALIZED PROCEDURE FOR MODELLING OF MEASUREMENTS FOR EVALUATING THE MEASUREMENT UNCERTAINTY

Klaus-Dieter Sommer, Manfred Kochsiek, Bernd Siebert, Albert Weckenmann

Abstract

The modelling of the measurement is a key element of the evaluation of measurement uncertainty in accordance with the basic concept of the Guide to the Expression of Uncertainty in Measurement (GUM). The model equation expresses the relationship between the measurand and all relevant input quantities contributing to the measurement result. It serves as a basis for propagation of the probability density distributions for the input quantities or, in case of (almost) linear systems, for Gaussian propagation of the related standard uncertainty contributions. A practical and highly versatile modelling concept has been developed. It is based on both the idea of the classical measuring chain and the measurement method used. Therefore, this concept gets on with only a few generic structures. The concept has led to a modelling procedure which is structured into five elementary steps. Only three types of modelling components are employed. It holds for most kinds of measurements performed in the steady state.

Keywords

probability, uncertainty, modelling

Download

PWC-2003-TC8-007.pdf

DOI

-

IMEKO TC

TC8 - Traceability in Metrology

Back to the proceedings